English Wikipedia has an article on:

ambassador

Wikipedia

• ambassadour (obsolete)
• embassador (archaic)
• embassadour (obsolete)

From Middle English ambassadore, from Anglo-Norman ambassadeur, from Old Italian ambassadore, from Old Occitan ambaisador (“ambassador”), derivative of ambaissa (“service, mission, errand”), from Medieval Latin ambasiator, from Gothic 𐌰𐌽𐌳𐌱𐌰𐌷𐍄𐌹 (andbahti, “service, function”), from Proto-Germanic *ambahtiją (“service, office”), derivative of Proto-Germanic *ambahtaz (“servant”), from Gaulish ambaxtos, from Proto-Celtic *ambaxtos, from Proto-Indo-European *h₂m̥bʰi-h₂eǵ- (“drive around”), from *h₂m̥bʰi- (“around”) + *h₂eǵ- (“to drive”).

Displaced native Old English ǣrendraca.

• (UK) IPA^(key): /æmˈbæs.ə.də(ɹ)/

• Audio (Southern England):

  (file)

• (US) IPA^(key): /æmˈbæs.ə.dɚ/, /æmˈbæs.əˌdɔɹ/

ambassador (plural ambassadors)

1. A minister of the highest rank sent to a foreign court to represent there his sovereign or country. (Sometimes called ambassador-in-residence)
   • 1982, Orville T. Murphy, Charles Gravier, Comte de Vergennes: French Diplomacy in the Age of Revolution, 1719-1787:

     Vergenne'fury reached its height when the priest tried to involve the English ambassador.

2. An official messenger and representative.
   • 1856, Mrs. William Busk, Mediæval Popes, Emperors, Kings, and Crusaders: Or, Germany, Italy and Palestine, from A.D. 1125 to A.D. 1268‎^[1], volume IV, London: Hookham and Sons, →OCLC, page 294:

     The new accusation brought by Urban against Manfred of murdering his sister-in-law's embassador – it may be observed that, tacitly, he acquits him of parricide, fratricide, and nepoticide – requires a little explanation.

3. A corporate representative, often the public face of the company.

   As front hall porter, you are an ambassador for the hotel.

4. (sports) A player who is an excellent role-model and who upholds the integrity of the game and thereby contributes to the sport's popularity and growth.

• In English the preferred construction is (Nationality) ambassador to (Country) (the French ambassador to the United States) or ambassador of (Sending Country) to (Receiving Country) (the ambassador of France to the United States).

• embassy

• consul
• high commissioner